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Detail:
  When the last task closes, the Wimp tries to change to the configured screen
  mode (as determined using OS_ReadSysInfo 1). However, the Wimp was using
  VDU 22,x to set the screen mode, so results were undefined when the default
  screen mode was a pointer to a mode selector. The Wimp now uses OS_ScreenMode
  to change mode (except on RISC OS 3.1 builds where the SWI is not available).
Admin:
  Not tested.

Version 4.51. Tagged as 'Wimp-4_51'